Shareholders' Equity And Earnings Per Share (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands								1 Months Ended					3 Months Ended		6 Months Ended		12 Months Ended
	May 25, 2017	May 11, 2017	Apr. 27, 2017	Apr. 25, 2017	Feb. 23, 2017	Feb. 09, 2017	Dec. 19, 2008	Apr. 30, 2017	Jan. 31, 2017	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2012	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Temporary Equity [Line Items]
Stock issued in public offering, shares										3,000,000
Proceeds from the issuance of common stock, net										$ 152,900					$ 0	$ 152,823
Cash dividends declared per common share (usd per share)								$ 0.14	$ 0.14				$ 0.14	$ 0.12	$ 0.28	$ 0.24
Common stock dividends per share declared annualized (usd per share)								$ 0.56	$ 0.56
Dividends payable, date to be paid	May 25, 2017				Feb. 23, 2017
Dividends payable, date of record		May 11, 2017				Feb. 09, 2017
US Treasury
Temporary Equity [Line Items]
Warrants outstanding, shares							1,643,295						51,307		51,307
Warrant termination period							10 years
Investment warrants, exercise price (usd per share)															$ 22.68
Warrants exercised, shares															290,545
Common stock shares issued from exercise of warrants															199,210
Common stock
Temporary Equity [Line Items]
Common stock issued, conversion of preferred stock, shares			3,069,828	51,244													729
Series D Preferred Stock
Temporary Equity [Line Items]
Preferred stock, shares issued										5,000,000	5,000,000		5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, liquidation value per share (usd per share)										$ 25	$ 25		$ 25	$ 25	$ 25	$ 25	$ 25
Preferred stock, value										$ 125,000	$ 125,000		$ 125,000	$ 125,000	$ 125,000	$ 125,000	$ 125,000
Preferred stock, Dividend payment terms											quarterly
Preferred stock, dividend rate, percentage											6.50%
Series C Preferred Stock
Temporary Equity [Line Items]
Preferred stock, shares issued												126,500
Preferred stock, liquidation value per share (usd per share)										$ 1,000		$ 1,000	$ 1,000	$ 1,000	$ 1,000	$ 1,000	$ 1,000
Preferred stock, value										$ 126,257		$ 126,500	$ 0	$ 126,257	$ 0	$ 126,257	$ 126,257
Preferred stock, Dividend payment terms												quarterly
Preferred stock, dividend rate, percentage												5.00%
Convertible preferred stock, rate of conversion, shares			24.72
Number of shares converted			124,184	2,073													30
London Interbank Offered Rate (LIBOR) | Series D Preferred Stock
Temporary Equity [Line Items]
Preferred stock, dividend rate, percentage, variable spread											4.06%